Px py and pz

[emmajanibekyan_4I]

I'm confused as to what these represent and how we use them.

[Laine Gruver 3C]

The 'p' refers to the p-block of the periodic table, with that specific type of orbital. As far as I understand, x, y, and z represent the different orientations that a p-orbital can have. I've included a picture that represents the orientations and where their nodes fall.

[Tyler_Honrada_1L]

I've seen this when writing out the hybridizations of certain bonds, is there any other instance where we would use them?

[Yuchien Ma 2L]

We generally only use this when determining hybridizations.

[edhuang]

The x in Px stands for the p orbital on the x axis. Likewise for the y in Py and the z in Pz. You use them in hybridization, but the notation just helps you to differentiate between the three orbitals and where they lie.